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Business Segment Information:
 3 Months Ended
Mar. 31, 2022
Segment Reporting Information, Additional Information [Abstract]  
Business Segment Information Business Segment Information
Our CODM reviews financial information presented on an operating segment basis for purposes of making decisions and assessing financial performance. Our CODM assesses the performance of our operating segments based on operating income.

For the first nine months of 2021, we had reported four operating segments: Electric Utilities, Gas Utilities, Power Generation and Mining. In the fourth quarter of 2021, we changed our operating segments to align with the revised manner in which our CODM reviews our financial performance and allocates resources. Our power generation and mining businesses, which were previously presented as separate operating segments, are now part of our Electric Utilities segment. This change aligns with our vertically integrated business model for our Electric Utilities. Comparative periods presented reflect this change.

Our operating segments are equivalent to our reportable segments.

Segment information was as follows (in thousands):

Total assets (net of intercompany eliminations) as of:March 31, 2022December 31, 2021
Electric Utilities$3,804,335 $3,796,662 
Gas Utilities5,232,594 5,246,370 
Corporate and Other93,725 88,864 
Total assets$9,130,654 $9,131,896 
Three Months Ended March 31, 2022External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$202,739 $870 $2,929 $— $206,538 
Gas Utilities619,030 931 1,319 112 621,392 
Inter-company eliminations— — (4,248)(112)(4,360)
Total$821,769 $1,801 $— $— $823,570 

Three Months Ended March 31, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$231,718 $807 $2,879 $— $235,404 
Gas Utilities398,499 2,408 1,520 92 402,519 
Inter-company eliminations— — (4,399)(92)(4,491)
Total$630,217 $3,215 $— $— $633,432 

Three Months Ended March 31,
20222021
Operating income (loss):
Electric Utilities$50,746 $39,343 
Gas Utilities123,540 102,094 
Corporate and Other(933)(3,122)
Operating income173,353 138,315 
Interest expense, net(38,545)(37,600)
Other income, net704 266 
Income tax expense(14,488)(494)
Net income 121,024 100,487 
Net income attributable to non-controlling interest(3,498)(4,171)
Net income available for common stock$117,526 $96,316